I'm hesitant to answer here. A month or so ago, around the time there were a series of discussions about plastic surgery, I wrote a post about 'what feature you would most like to change if you could', and I got the smackdown from Angie. And rightly so. It does no good to focus on your flaws. So I'll answer, but in the spirit of positivity, because all things considered, I have no right to complain.
Best and worst? Hard to say. I tend to focus on my belly because I get premenstrual bloat a lot, but really, I should get over myself, because it's pretty flat. My eyes are not as large and round as I'd like them to be, I suppose. If I had a magic wand I'd make 'em bigger. But truth be told, I don't think I have any real problem areas, nor any really exceptional ones. Hair, skin, teeth, nose, boobs, legs, backside, feet -- all the things that women complain about -- they're all good, but not *remarkably* good.
I guess that means I don't have a most distinctive feature! I think the whole teeny-tiny, elfin package is probably what's distinctive.